Hi Matt

Futaba supplies RC systems for our hobby strictly as an additional product using their existing technology. A quick Google search finds that, among other commercial uses are the control of cranes, rail links, and mining uses. The same sites show that the 72-76 MHz bands are used.

They sell both registered and unregistered stations. Note that the FCC regs give priority to commercial use, the way I read them.

http://www.futaba.com/products/irc/i...tion/index.asp
http://www.cattron-theimeg.com/csa/

They even discuss spread spectrum.

Many products are not on our frequencies, but, some are.

Although 72.39 is not specifically mentioned, my guess is that it is used.
Heck, you know more than most about this, I am really hesitant to post anything about the subject. I am sure that a little additional research would show other manufacturers also providing commercial rc equipment on "our" frequencies.

JR